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Cylindroid Helical Coil Rotor Return Pressure Long Compression Mechanical Spring 65Mn Steels 300mm Wire Diameter 1.5-4.0mm Cylindroid Helical Coil Rotor Return Pressure Long Compression Mechanical Spring 65Mn Steels 300mm Wire Diameter 1.5-4.0mm Cylindroid Helical Coil Rotor Return Pressure Long Compression Mechanical Spring 65Mn Steels 300mm Wire Diameter 1.5-4.0mm